JP2005154269A - Transparent and colorless glass or glass ceramic panel having optically dense colored coating, and method for manufacturing the panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart a coating to which different colored printing is given by an inexpensive method comprising a single coating process when possible, and which has a sufficient optical or visual density, and which is capable of selecting flexible color and design and maintaining strength of a glass panel or a glass ceramic panel even after coating treatment to the glass panel or the glass ceramic panel, being exposed to high heat load. <P>SOLUTION: The surface of the transparent and colorless glass panel or glass ceramic panel, being exposed to high heat load, is wholly or partially coated with the visually dense, high-temperature-stable coating. The coating is constituted so as to include an organic/inorganic reticular structure containing filler particles and at least one kind of color-imparting pigments and not to have a melting reaction zone on the surface of the transparent and colorless glass panel or glass ceramic panel, coated with the visually dense, high-temperature-stable coating. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention is a clear, colorless, colorless, high-temperature, stable coating that is exposed to high heat loads during use and in the form of an organic / inorganic network with a color-imparting pigment. A transparent glass or glass ceramic panel.
The invention also relates to a method for producing such a coated glass or glass-ceramic panel.
The invention further relates to a cooking unit comprising such a coated glass or glass-ceramic panel that provides a cooking surface.

  In the present invention, the term “glass or glass-ceramic panel” includes not only a flat panel, but also an angled, inclined or bent panel, and a curved panel. The panel may be rectangular, circular, or annular, and may have other shapes. The glass panel according to the invention can only be produced from glass with a very low coefficient of thermal expansion and sufficient “hardness”, for example prestressed borosilicate glass.

  Regarding the technical problem to be solved by the present invention, a flat glass ceramic panel used as a cooking surface of the latest cooking range will be described below as a typical application example, but only for the application according to the present invention. It should not be understood as limited. In addition to glass panels that provide cooking surfaces, such technical problems include applications such as glass window or glass ceramic fireplace window glass, glass or glass ceramic oven door windows, glass or glass ceramic lighting covers, etc. However, this applies to the necessary changes.

Cooking ranges with glass ceramic panels that provide cooking surfaces are marketed in the art. A glass-ceramic material is transparent in the visible region of its spectrum. Thus, for example, radiation from kitchen lighting can pass through the material from the heating element in the cooking zone heated up or down, eg radially, so that the heating element must be hidden under the glass ceramic cooking surface , Cables and other structural parts will be visible.
However, it is annoying for users to see these structural parts. Therefore, as seen in EP 0220333 as a typical example, the glass ceramic panel serving as the cooking surface is colored with color-imparting ions so that the working part of the cooking range under the glass ceramic panel is not practically visible from above. And its transparency in the visible range is reduced. Therefore, such a cooking surface is not practically transparent to visible radiation, that is, is opaque, and has a black or dark appearance when viewed at a transmittance according to the color-imparting ions used. It looks reddish purple or orange / brown. These opaque glass-ceramic materials can be used only in a limited display system such as residual heat display, which is a fundamental defect.

  Applying a visually dense coating process with a color imparting property to the lower surface of a translucent glass ceramic panel with the display as a cooking surface is one known solution to the problem of making the glass ceramic or glass panel optically opaque. This is a solution. In this regard, JP 7-17409 and JP 51-89517 disclose a glass ceramic panel as a cooking surface made of a transparent and colorless glass ceramic material having a high temperature resistant paint applied to its lower surface. Since the paint layer is layered so as to be opaque, that is, to replace the conventional color, the cooking surface has a black appearance.

  In order to provide the required optical or visual density, the paint must be processed to be a relatively thick layer. However, since the glass ceramic panel and the paint have different coefficients of thermal expansion, there arises a problem that deep cracks occur on the paint layer or the coated glass ceramic surface. Further, the paint layer may be further partially peeled off or peeled off due to deep cracking.

  A transparent glass-ceramic cooking surface whose bottom surface is visually densely coated is also disclosed in DE 10014373 A1 (WO 01/72087 A1), which is equivalent to DE 20019210U1. In the case of the reference DE 10014373 A1, the decorativeness is also given by the coating on the lower surface. On the other hand, in the case of reference DE20019210U1, the coating on the lower surface is a uniform single color, and the cooking surface on the upper surface of the panel is subjected to a decorative coating process on the entire surface.

  Paints based on organic materials, especially glossy paints, especially paints based on glass flux using borosilicate glass flux and titanium or cesium oxide as pigments, general pigments, glossy pigments, metallic A colored sol-gel coating agent containing an appearance-providing pigment, a pearl luster-imparting pigment, or a mixture thereof is useful as a coating material for coating on the lower surface of a glass or glass ceramic panel.

  The coating treatment on the lower surface of the glass or glass ceramic panel is performed by a printing process. The glass ceramic panel may be provided with a knob (projections are provided on the surface), or both surfaces may be smooth. In general, a panel with a knob is less likely to be damaged than a panel with smooth both sides. However, more problems arise when printing a panel with a knob.

  In general, the colored bottom coating described in the aforementioned references does not become visually dense in a single printing process. The optical density of the coating is increased by using multiple layers. That is, in order to obtain the required optical density, it is essential to perform a relatively thick bottom coating.

  Of course, the above characteristics do not apply to paints based on organic materials. This is because these paints do not reduce or only slightly reduce the strength of the glass ceramic cooking surface. However, these organic paints have limited high-temperature heat resistance due to organic components, and also have the disadvantage of irreversibly fading. General components such as silicon, polyester, or resin decompose at 400 ° C or higher. However, the temperature below the cooking zone usually reaches 600 ° C. or more when continuously used. Temporarily, the temperature reaches 800 ° C. Since the organic paint described above decomposes under a heat load, a decomposition product is released, and it no longer adheres after a certain time.

  In addition to the coating printing process on the lower surface of the glass ceramic panel, a method for processing a plasma sprayed coating on the lower surface of the glass ceramic panel is known from DE 10122718 A1. Such treatment increases the opacity of the glass ceramic panel to visible light and provides overall color and / or protection from scattered light propagated from the halogen cooking system. There is no disclosure in this reference regarding the strength of the coated cooking panel that generally occurs. In general, the strength of glass ceramic panels is significantly reduced by impinging hot particles against the glass ceramic surface, so this method has a particularly critical limit. This method also limits the choice of colors considerably. Of course, it is possible to add a colored pigment to an actual coating substrate, but it is usually impossible to spray the colored pigment in this method because the melting point of these pigments is high. In addition, it is only possible to color or darken the coating to some extent by this method.

According to the state of the art, several different coating processes are required during the coating of glass ceramic panels in order to obtain various optical prints of different colors, mixed colors, metallic colors (metallic), black, etc. The In particular, in order to give a metallic print by the lower surface coating, it is often required to combine different coating methods (screen printing method, vacuum coating method). In some cases, the desired impression can only be obtained by exact matching of the entire top and bottom coatings. Similarly, the production of the desired optical density is not possible with a single coating process and is often obtained by a combination of top and bottom coatings.
The same is true for the sol-gel solutions colored with most different pigments and / or mixtures thereof. Without further steps relating to the composition of the sol-gel solution, the color generation with the pigment, and the treatment of the sol-gel colored coating on the glass-ceramic panel surface, it is impossible to avoid the aforementioned drawbacks.

  The state-of-the-art state-of-the-art in the sol-gel coating field does not give any suggestion as an appropriate solution to the above problem. WO 96/29447 describes a colored sol-gel coating for glass, ceramic or metal applications at high temperatures. For example, various sols and various color pigments are combined to obtain a functional coating against abrasion caused by kitchenware. There is no sol that is compatible with all of the particles used, or a mixture of particles used. Moreover, there is no description regarding glass ceramic coating. The maximum coating thickness obtained by single layer processing was 6 μm. In order to obtain a larger layer thickness, for example 10 μm, a plurality of coating processes are required. The sol-gel coating is then baked at temperatures up to 1000 ° C., but since it melts on the substrate surface, the strength of the coated glass ceramic panel or glass panel is reduced.

The present invention provides different colored prints in an economical manner using a single coating process if possible, with sufficient optical or visual density, and flexible color and design choices, And it aims at providing the coating which can hold | maintain the intensity | strength of glass or a glass ceramic panel after a coating process to the glass panel or glass ceramic panel exposed to a high heat load.
It is a further object of the present invention to provide the coating on a glass ceramic or glass panel having both a knob and a smooth panel surface.
Another object of the present invention is to provide a method for producing a transparent colorless glass or glass-ceramic panel provided with the coating that meets the above requirements.

  The above objectives and other objectives that will become more apparent in the following description are those that are exposed to high thermal loads during use, and that a visually or optically dense and high temperature stable coating on the entire surface or a partial coating is a color imparting pigment. This is achieved by a transparent colorless glass or glass ceramic panel applied in the form of an organic / inorganic network comprising at least one of the above.

  According to the present invention, the network includes filler particles, and the coating does not have a melting reaction zone on the coating surface of the glass or glass ceramic panel on which the coating is formed.

According to the present invention, a method of coating a visually or optically dense high temperature stable coating on a transparent colorless glass or glass-ceramic panel that is exposed to high heat loads during operation comprises:
a) preparing a reactive organic / inorganic network comprising a plurality of components;
b) introducing a predetermined amount of at least one color-providing pigment and filler particles into the reactive organic / inorganic network and / or components of the network;
c) treating the prepared organic / inorganic network comprising at least one color-imparting pigment and filler particles introduced in step b) into a glass or glass-ceramic panel to coat the glass or glass-ceramic panel Process,
d) the at least one color-providing pigment and filling under thermal conditions so that no melting reaction zone is formed between the paint coating and the coated surface of the glass or glass-ceramic panel coated with the paint coating. It comprises a step of baking the organic / inorganic network containing material particles to form a paint coating on a glass or glass ceramic panel.

  The basis of the paint coating according to the invention is the first coating (first meaning see 0032) that forms a reactive organic / inorganic network with pores after processing, this coating being colored in This is called a coating substrate in which a conductive pigment or color former and filler particles are embedded and adhered to the panel surface.

  In addition to other possible ways of forming this type of network, in a preferred embodiment, an initial or starting coating prepared with a sol-gel solution is the basis for the paint coating according to the invention. .

Sol-gel methods are known for forming mechanically durable metal oxide coatings. The coating liquid is prepared by reacting the metal organic starting materials in the molten state. In general, the metal organic starting material creates a network structure of metal oxides, that is, a structure in which metal atoms are bonded to each other by controlled hydrolysis and condensation reactions with oxygen atoms. These reactions involve separation of reaction products such as alcohol and water. Careful drying and generally baking of the processed sol-gel solution to the substrate is performed to remove undesirable reaction products and / or residual organic components from the desired solid coating. Bubbles are created during removal of the reaction products and organic components that create hollow gaps, or pores, in the sol-gel coating to impart porosity to the coating.
In the hydrolysis, condensation, and drying steps, the sol-gel solution moves from a liquid phase to a gel phase and finally becomes a solid phase when it forms the desired solid layer.

  If the initial sol-gel layer is used with a colored pigment in a separate process that attempts to form a thick coating on a glass or glass ceramic panel, for example, the 30 μm thick coating required to provide the required optical density, When reaction products and organic components, especially alcohol, are driven out from the bottom, a relatively large volume of hollow gaps (pores) are created in the top of the coating. This causes a positional shift or distortion of the pigment structure that causes bulges in the coating, especially when the pigment is flaky in nature, such as bright pigments, special mica, or faint pigments such as iriodine. Due to such influence, the mechanical durability or strength of the treated layer, that is, the wear resistance and heat load resistance (variability) are significantly impaired.

In addition, the thick paint coating creates a stronger physical force during loading due to thermal changes, causing mechanical pressure in the coated panel or plate, and also from the thermal expansion coefficient of the glass or glass ceramic material. Also has a negative influence on the mechanical strength due to its large thermal expansion coefficient. This is particularly true since the sol-gel paint coating is burned out at a relatively high temperature according to the state of the art, resulting in a fusion of the colored coating in the coated panel surface, ie a hard finish. is there.
Therefore, the state of the art (JP2003-168548A) uses two coatings on a glass-ceramic panel that provides a cooking surface in order to obtain the required optical and visual density using a thin coating in a hot cooking zone. Teaching to process.

In order to perform a thick paint coating process in a single coating without the above-mentioned series of disadvantages, filler particles according to the present invention, which are typically smaller than pigments or color formers, are coated with a coating substrate, preferably a sol. -Introduce into the gel network. These filler particles fill the hollow gaps between the color formers or pigments. The shape of these filler particles is preferably a spherical shape such as SiO ₂ deposited by thermal decomposition so that the “filling degree” is as high as possible. The particles may have other shapes but should not be flaky or leafy. Introduced filler particles allow a lower sol-gel mass per unit volume in the paint coating, thereby reducing gas generation. As a result of the reduced generation of gas, the pores of the coating according to the invention are finer. In other words, the filler particles align the colored pigment particles so that the colored pigment particles are not pressed or expanded to generate less gas.

  As shown in the electron micrographs, usually the colored pigment and filler particles are bonded to the sol-gel network so that the sol-gel structure surrounds both the filler particles and the colored pigment particles or portions. These particles or lumps react with the sol-gel network due to the inherent reactivity of the sol-gel. Therefore, since the paint coating according to the present invention is extremely mechanically durable even when the coating thickness is large, it can function as a protective layer that protects the glass or glass ceramic panel from scratches and the like.

  In accordance with the coating material according to the invention, the compensatory filler particles allow the use of different colored pigments, i.e. different mixed colors, in a single coating substrate.

  While the paint coating according to the present invention is not tightly fused onto the panel surface, the glass or glass-ceramic panel surface is completely coated with the paint coating by bonding to the panel surface only with a chemical reaction that ensures sufficient adhesion, so The paint coating does not impair or reduce the strength of the glass or glass ceramic panel. This is because the difference in coefficient of thermal expansion between the paint coating and the panel is absorbed by the fine porosity of the paint coating. Thus, the coating according to the present invention is not only high temperature stable, but also wear and adhesion resistant. Therefore, the strength of the coated glass or glass ceramic panel is not reduced by the entire coating on the lower surface of the glass or glass ceramic panel. This is also true for paint coatings having a thickness of about 30 μm that are coated in a single process.

  In the following, a highly advantageous embodiment of a method for coating a glass ceramic panel with a colored sol-gel coating that functions as a coating substrate according to the invention will be described. However, it should not be understood that the present invention is limited to the embodiments described below, as other embodiments using organic / inorganic networks are also contemplated.

In the first step, a sol-gel solution is prepared. Any sol in a system based on TiO ₂ or ZrO ₂ is in principle suitable for the production or preparation of sol-gel coated substrates. Particularly preferred is a sol based on SiO ₂ . The composition of the sol is consistent with the standard sol composition used for the production of thin optical coatings using sol-gel technology. As the Si precursor, tetraethylorthosilicate (TEOS) or a derivative thereof is preferably used. Various organic solvents such as water, hydrochloric acid, and propanol are used as auxiliary precursors. The exact composition of the sol can be varied over a wide range. As the Si starting material, silanes, siloxanes and the like are generally suitable.

A predetermined amount of pigment, ie, color former (dye) is added to the prepared sol. The exact amount varies depending on the color former used. Further, a predetermined amount of filler particles determined by the amount of the color pigment is added.
The color former and / or filler particles can be mixed with at least one of the precursors.

  The resulting paint coating is processed into a glass ceramic panel. This process can be performed using various methods. The paint can be treated by any one of application, immersion, and spraying. Of these, the preferred method that can be recommended is spraying. By using the screen printing method, the paint coating can be processed very easily into a lattice shape. The paint is dried after the paint coating process. This drying is carried out in ambient air for about 30 minutes and at a further elevated temperature (eg 50 ° C.) for several minutes. Subsequent baking is performed at various temperatures. Particularly preferably, the baking is carried out at a temperature of about 180 ° C. for 20 minutes. It is also usually possible to shorten the baking process time without compromising the performance of the coating.

  By the way, moisture collects on the lower surface of the glass or glass-ceramic panel that provides the cooking surface, and fading occurs when the moisture passes through the porous coating. Therefore, it is preferable to perform an outer sealing coating treatment that is impermeable to oil and water on the paint coating surface. The sealing coating may be transparent or colored (from black to white), and can be applied to the entire or partial surface of the important part.

From the above features of the present invention, the following series of effects can be obtained.
Full surface coating on glass / glass-ceramic panels with no reduction in strength at high temperatures:
Due to the extremely fine porosity of the paint coating, the temperature difference between the coating and the panel is mitigated, thereby preventing or minimizing the generation of thermal strain. Therefore, the coating produced according to the above method can be applied to the entire surface of the glass / glass ceramic panel as an undercoat. Further, the adhesion of the coating to the substrate is sufficiently maintained even at a temperature reached during use of the cooking surface (for example, 700 ° C., 10 hours).

Visually or optically dense coating:
In coatings with glass flux based coatings, there is usually a compromise between the coating thickness (optical density of the coating) and the reduction in strength of the glass or glass ceramic panel, but according to the invention. The method makes it possible to produce a completely optically dense coating without a significant reduction in panel strength. In a particularly preferred embodiment, there is little degradation from the strength of the uncoated glass or glass ceramic panel, even after significant heating of the coated plate.

Manufacturing technology that gives various colors:
The above-described method for producing a particle-filled coating agent based on a sol-gel is basically known. That said, not all fillers or particles and every sol are compatible, so not all of this type of coating can be produced. In the prior art, different sols are required depending on the filler. However, according to the principles of the present invention, the color former and filler particles can be mixed simply and easily by a suitable technique and mixed into the sol, so that a coating having various colors is provided using only one kind of sol. It is possible.

Low baking temperature:
High bake temperatures have been required for glass flux-based coatings that have been used to decorate glass ceramic coatings to date. Known sol-gel pigment layers are likewise baked at high temperatures. In contrast, according to the present invention, baking is performed at a temperature of about 200 ° C. for several minutes after a short drying time with a slight increase in temperature, so that any other stress is durable and baking is performed at a high temperature. Similar to prior art coatings, it is possible to obtain a coating with strong adhesion that meets all the requirements of a glass or glass ceramic panel primer that provides a cooking surface. The coating according to the invention is also sufficiently durable against abrasion or peeling.

Simple processing method:
The coating treatment is preferably carried out by spraying and is therefore suitable for both smooth and knobbed surfaces. Since the adjustment of the coating thickness is easily performed by controlling the movement of the substrate during spraying, a visually moderately dense coating has already been obtained after one treatment. It is not necessary to have multiple layers, but it is usually possible to have multiple layers as required, for example for the display of the lower cooking zone.

Absence of reaction zone:
Due to the very low baking temperature, the glass / glass ceramic is not chemically affected. This is particularly evident by the absence of reaction zones (partial melting of the glass or glass ceramic material surface). Therefore, no significant strength reduction of the glass or glass ceramic occurs. However, sufficient adhesion can be obtained even at the baking temperature thus reduced by the characteristic composition of the sol.

  The above invention will be described in more detail with reference to the embodiments described below. However, the details described in the following examples should not be construed to limit the scope of the claims appended hereto.

First, a sol having the following composition is mixed and then stirred.
-TEOS (tetraethylorthosilicate) 40-60g
-N-propanol 20-50 g
-Water 18-26g
-Concentrated hydrochloric acid 2-6g
Further, ethylene glycol is added to adjust the viscosity of the sol.
A sol based on TEOS is particularly suitable as a coating substrate for sol-gel coating according to the invention.

One kind of color imparting pigments exemplified below or a mixture thereof is added to the sol.
-Spinel-based pigments (BASF Sicocer F2555; magnesium aluminum spinel)
- oxide pigments (especially Bayferrox110,220; black Moki side Green GN; _TiO 2), and - the pigment of the zirconium base (BASF Sicocer F2255,2355,2360)
Preferably, a bright pigment, particularly a mica pigment such as iriodin, is used to provide a metallic luster effect in the coating.

  The mixing ratio of sol to pigment is usually 1: 1 by weight. This mixing ratio can be varied to obtain an optimally prepared coating solution or to retain certain types of pigments. By using a certain type of pigment that gives a good coating, it is possible to reduce the mixing ratio of 50% by weight of the pigment to about 20% by weight.

Filler particles are added into the paint pigments that make the coating microporous. For example, talc, calcium carbonate and barium sulfate are suitable as fillers. SiO ₂ and TiO ₂ deposited by pyrolysis are particularly suitable as fillers. This is because these materials have a spherical structure, so that a special “geometric profile” that fills the hollow gaps, that is, the relatively large pores in the sol-gel network and the gaps between the paint pigments, It is for having. These pigments thus produce microporosity. This can be said to some extent also about the glitter paint particles (Iriodin) that have a leaf-like structure and are used to generate metallic luster, for example.

  Samples made in accordance with the present invention exhibited the expected properties with respect to optical density, mechanical strength, and no effect on substrate strength.

The pigment-containing coatings according to the invention are particularly suitable for special applications as colored undercoats of transparent glass ceramic panels that provide a cooking surface. Heating of the cooking zone on the cooking surface can be done not only electrically radiatively but also electrically, or using a gas burner, in particular an atmospheric gas burner such as a conventional top burner, burner mat or so-called ring burner. It is also possible.
Similarly, baking oven doors, fireplace doors, and lamp covers can be manufactured using glass ceramic materials that are fully or partially coated with a paint coating according to the present invention.

  Coated glass or glass ceramic panels according to the present invention are visually dense to the extent desired, but are opaque due to the embedded particles. Therefore, although it is visually dense, it is possible to provide illumination from the lower side. That is, such a panel forms a kind of projection surface for markings such as cue means such as, for example, cooking zone indications, for example company logo modifications, and residual heat display. The illumination can be monochromatic or multi-colored, and can also be arranged in a heating zone or cooking area. The illumination can be a stationary type or a movable type that moves the illumination component.

  Although the present invention has been embodied and described as a transparent colorless glass or glass ceramic panel coated with a visually dense pigment-containing coating agent and a method of manufacturing the panel, the present invention has been described without departing from the spirit of the present invention. Since various changes and modifications can be made to the invention, it is not intended to limit the invention to the details described above.

Since the gist of the present invention does not require further analysis and is sufficiently disclosed by the above description, a third party can apply the latest knowledge to determine the general or specific aspects of the present invention from the standpoint of the prior art. It is possible to easily adapt the present invention to various applications without leaking the features that clearly constitute the essential features of this embodiment.

Claims (41)

A transparent colorless glass or glass-ceramic panel that is exposed to heat load and that is entirely or partially covered with a visually dense high temperature stable coating,
The coating comprises an organic / inorganic network comprising filler particles and at least one color-providing pigment; and the coating is transparent coated with the visually dense high temperature stable coating The glass or glass-ceramic panel, wherein the glass or glass-ceramic panel surface has no melting reaction zone. 2. The glass or glass ceramic panel according to claim 1, wherein the organic / inorganic network comprises a sol-gel network. 2. A glass or glass ceramic panel according to claim 1, wherein the thickness of the visually dense high temperature stable coating is in the range of 4 to 100 [mu] m. 4. The glass or glass ceramic panel according to claim 3, wherein the thickness is in the range of 15 to 30 [mu] m. The glass or glass-ceramic panel according to claim 1, wherein the at least one pigment contains a color former, and the filler particles are smaller than the color former. 2. The glass or glass ceramic panel according to claim 1, wherein the filler particles have a rounded shape. The glass or glass ceramic panel according to claim 1, wherein the filler particles have a spherical shape. 2. The glass or glass ceramic panel according to claim 1, wherein the at least one color imparting pigment is a bright pigment. 9. The glass or glass ceramic panel according to claim 8, wherein the bright pigment is mica particles. The glass or glass-ceramic panel according to claim 9, wherein the mica particles are made of iriodine. a) preparing a reactive organic / inorganic network comprising a plurality of components;
b) introducing a predetermined amount of at least one color-providing pigment and filler particles into the organic / inorganic network and / or components of the network;
c) coating the glass or glass-ceramic panel by applying to the glass or glass-ceramic panel an organic / inorganic network comprising the at least one color-imparting pigment and filler particles introduced in step b) Process,
d) the at least one color-providing pigment and filler under heating conditions so that a melting reaction zone is not formed between the paint coating and the glass or glass-ceramic panel on the surface coated with the paint coating. Consisting of baking the organic / inorganic network containing particles to form the paint coating on the glass or glass ceramic panel;
A method of coating a visually dense high temperature stable coating on a clear colorless glass or glass ceramic panel that is exposed to heat load during use. 12. The method of claim 11, wherein the organic / inorganic network is prepared from a sol-gel. The sol - The method of claim 12 wherein, wherein the gel is prepared from the sol to the base material of SiO _2. The method of claim 13 wherein wherein a sol of the SiO ₂ as a base material is prepared by using a silane or siloxane starting material. 15. The method of claim 14, wherein the silane or siloxane starting material comprises tetraethylorthosilicate or a derivative thereof. The sol of SiO ₂ as a base silane or siloxane starting materials and method of claim 13 wherein wherein the prepared using water as an additional starting material, the acid and at least one organic solvent . 13. The method of claim 12, wherein the sol-gel and the at least one color imparting pigment are mixed in equal parts by weight. The method according to claim 11, wherein the filler particles include SiO ₂ particles, TiO ₂ particles, talc particles, calcium carbonate particles, or barium sulfate particles deposited by thermal decomposition. 12. The method according to claim 11, wherein the treatment method of the organic / inorganic network including the at least one color-imparting pigment and the filler particles is a spray method or a screen printing method. The method further includes drying the glass or glass ceramic panel coated with the organic / inorganic network including the at least one color-imparting pigment and filler particles at room temperature for at least 5 minutes or at elevated temperature for about several minutes. 12. The method of claim 11, wherein: 21. The method of claim 20, wherein the glass or glass-ceramic panel is dried at the room temperature for 30 minutes or at 50 [deg.] C. for approximately several minutes as described above. 21. After drying, the organic / inorganic network comprising the at least one color imparting pigment and filler particles is baked onto a glass or glass ceramic panel at about 180 ° C. for 20 minutes. Method. A cooking unit comprising a transparent colorless glass or glass-ceramic panel that is exposed to a thermal load during use and is provided with a visually or optically dense high-temperature stable coating that is fully or partially covered,
The coating comprises an organic / inorganic network comprising filler particles and at least one color imparting pigment, and the coating comprises the glass or the coating coated with the visually or optically dense high temperature stable coating. The said cooking unit characterized by not having a melting reaction zone between the said coating and the said glass or glass ceramic panel in the glass ceramic panel surface. 24. A cooking unit according to claim 23, wherein the coating is applied to the lower surface of the glass or glass ceramic panel. 24. A cooking unit according to claim 23, wherein the glass or glass-ceramic panel has an anti-grease and moisture-proof finish applied to the visually or optically dense high temperature stable coating. . 26. The cooking unit according to claim 25, wherein the seal coating is a coating that covers the entire surface or only part of the visually or optically dense high temperature stable coating. 26. A cooking unit according to claim 25, wherein the sealing coating is transparent and / or colored. 24. A cooking unit according to claim 23, wherein the thickness of the coating is in the range of 4 to 100 [mu] m. The cooking unit according to claim 23, wherein the at least one pigment includes a color former, and the filler particles are smaller than the color former. The cooking unit according to claim 23, wherein the filler particles have a rounded shape. The cooking unit according to claim 23, wherein the at least one color-providing pigment is a bright pigment. 32. A cooking unit according to claim 31, wherein the bright pigment comprises mica particles. Said visually or optically dense high temperature stable coating preparing a reactive organic / inorganic network comprising a plurality of components; and a predetermined amount of said at least one color-providing pigment and filler particles. In the reactive organic / inorganic network and / or into the components of the network, and the organic / inorganic network including the at least one color-providing pigment and filler particles in the glass Alternatively, the glass or glass ceramic panel is applied to a glass ceramic panel, and the organic / inorganic network containing the at least one color-providing pigment and filler particles is baked under heating conditions to form the glass or glass. A glass or glass coated with the paint coating, which forms a paint coating on the ceramic panel. 24. The cooking unit according to claim 23, wherein the cooking unit is manufactured using a method comprising a step of preventing a melting reaction zone from being formed between the paint coating on the ceramic panel surface and the glass or glass ceramic panel. . The organic / inorganic networks sol - are prepared from the gel, the sol - gel is prepared from the sol to the base material of SiO _2, and additional starting sol of the SiO ₂ and the base material is a silane or siloxane starting materials The cooking unit according to claim 33, wherein the cooking unit is prepared using water, acid, and at least one organic solvent as raw materials. The cooking unit according to claim 33, wherein the filler particles include SiO ₂ particles, TiO ₂ particles, talc particles, calcium carbonate particles, or barium sulfate particles deposited by thermal decomposition. The cooking unit according to claim 33, wherein the treatment method of the organic / inorganic network structure including the at least one color-imparting pigment and the filler particles is a spray method or a screen printing method. Drying the glass or glass-ceramic panel coated with the organic / inorganic network containing the at least one color-imparting pigment and filler particles into the method for at least 5 minutes at room temperature or for about several minutes at elevated temperature; 38. The cooking unit according to claim 37, further comprising: 38. Cooking according to claim 37, wherein after drying, the organic / inorganic network comprising at least one color-imparting pigment and filler particles is baked into a glass or glass-ceramic panel at about 180 ° C. for 20 minutes. unit. 24. The cooking unit according to claim 23, further comprising means for heating the cooking zone of the glass or glass ceramic panel using electric heat dissipation, electric induction, or combustion gas. The cooking unit according to claim 23, further comprising means for illuminating the glass or glass-ceramic panel from below. The visually or optically dense high temperature stable coating is not completely opaque and the illumination means is configured to form a variable image or marking in the coating for decoration and cueing; 41. A cooking unit according to claim 40, characterized in that: